NGINX: Remove unused substitutions module. #11747

Job	Run time
changes	3s
lua-lint	4s
test-go	3m 58s
Build	13m 55s
Verify Doc generation	8s
Chart / Lint	38s
Chart / Test (v1.28.15)	12m 0s
Chart / Test (v1.29.12)	11m 46s
Chart / Test (v1.30.8)	11m 57s
Chart / Test (v1.31.4)	11m 41s
Chart / Test (v1.32.0)	11m 19s
Kubernetes chroot (v1.28.15) / Kubernetes CHROOT	45m 46s
Kubernetes chroot (v1.29.12) / Kubernetes CHROOT	54m 59s
Kubernetes chroot (v1.30.8) / Kubernetes CHROOT	45m 41s
Kubernetes (v1.28.15) / Kubernetes	48m 31s
Kubernetes chroot (v1.31.4) / Kubernetes CHROOT	54m 37s
Kubernetes chroot (v1.32.0) / Kubernetes CHROOT	48m 30s
Kubernetes (v1.29.12) / Kubernetes	46m 25s
Kubernetes (v1.30.8) / Kubernetes	48m 15s
Kubernetes (v1.31.4) / Kubernetes	47m 46s
Kubernetes (v1.32.0) / Kubernetes	47m 17s
	9h 25m 16s

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